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32                                             PT,ORA   INDICA.
<z. major, foliis orbicularibus inciso-crenatis, acheniis longioribus in
capitulum oblongiim colieetis.
j3. alpmus (Hook.); minor, foliis ellipticis vel oblongis apice triueu-
tatis, acheniis lafcioribus brevioribus in capitulum globosum collectis.
HAB. In Tibet occ. ubique, inter Iskardo, alt. 7000 ped.! et Hundes!
(a. rarior, in paludosis 10-12,000 ped.; ft. vulgatissimus, usque ad
17,000 ped. alt. adscendens) et in Sikkim interioris alpibus, alt. 11,500-
14,000 ped.!—(v. v.)
DISTRIB. Sibiria! Persia! America bor. in planitie a Novo Eboraco
in inontibus a Mexico usque ad mare arcticum! in Americas austr. tem-
peratos et tropicae alpibus!
HerBa parva (seepe pusilla), stolonitera, ad nodos radicans et foliosa. Folia forma
valdc varia, orbicularia elliptica vcl oblonga, regulariter iuciso-crenata, veT apicc tan-
turn triloba, basi rotundata vel cordata, Ł-1 poll, longa. Scapl folia aqnantea vel
longiores, 1-6- (vel rarissime 12-) uuciales, 1-pauciflori, aphylli, vel ad ramification.es
bracteas lineares incisasve gerentes. Flores i-^-unciales, flavidi. Sepafa 5, ovalia,
patentia vel reflexa, membranacea, subcolorata. Petala 5-8, anguste obovata, Ache-
ma numerosa, obovata, compreasa, dorso gibbosa, stylo brevi unciuato vel recto apicu-
Jata, utrinquc longitudinal!tor tricostata*
This, though a very variable plant in form of leaf and in size, is well characterized
by the longitudinally ribbed fruit. It is extremely widely diffused, and as all the
forms have a. wide extension, there can, we think, be no doubt, notwithstanding
slight differences in the shape of the leaves and fruit, that only one species exists.
§ 2. Jolw. omnia secta, caulis radicans.   (E. diffusus, DC., in quo
caulis ad nodos radicans cum affinibus, in § 4 quŁerendus.)
8.  R. radicans (C. A. Meyer in Ledeb. -Fl. Alt. ii. 816); pro-
stratus, radicans, foliis reniformibua 3-5-lobis, floribus oppositifoliis,
acheniis numerosis subglobosis.—Ledeb. Ic. Alt. ^.116, M. Itoss. i. 34,
B. natans, 0. A. May. m led. Ic. Alt. t. 114, et FL Ross. i. 34.
HAB. In Tibet occidental! alpiuo: Ladafc 14-16,000 ped., H* Stra-
e%7 Hundes, Sir, et Wint.!—(v. v.)
DISTKIB. Sibiria, Ledeb. I
fferoa prostrata, ^kbra, in paludosis radicans, ct radices plurimas albas fibrillosas
emittens, interdum fluitans. jfe/m ad nodos in nmiulo abbreviate axillari plura, re-
niformia, pollicaria, 3-5-loba vel 3-5-fida, lobis rotundatia vcl crenatis. Floret parvi,
diametro -|-imciales, oppositifolii vel subterminalcs, longe pcdicellati. Sepafa reflexa,
Pekila late obovata, fere rotnndata, sepalis vix lougiora. Acbenia plurima, parva, in
capitulum fere, -l-unciale globosum collecta, vix compressa, stylo brevissimq mucro-
nata.
The two species distinguished by Meyer and ledebonr differ in nothing but the
degree of division of the leaves.
9.  R. hyperboreua (Bottb. Act. Hafn. x. 458. t. 4. f. 16); pu-
sillus, stoloniferus vel erectus, folfls 3-5-fidls, floribus solitariis, acheniis
numerosis parvis subglobosis.—DC. Prod. i. 35; Ledeb. JL Eos*, i. 35;
Tvrr. et Gray, $1. N. Am. i. 20.   K pygmteus,, WaU. JL Lapp. 157.
i. 8./. 1; DC. Prod. 1,85; Ledeb. M. Ross. i. 36; torrty et Gray, I. c.
HAB. In summis alpibus: Ladak, H. Strachey!
mont! et Sikkim, alt. 15-17,000 pcd.l—(v. v.)